Water observed pooling inside an astronaut 's helmet was reason enough for NASA to cut short a spacewalk Tuesday morning .

The spacewalk outside the International Space Station was planned to last for six and a half hours , but ended after one hour and 32 minutes , said NASA spokesman Kelly Humphries . That makes it , according to NASA 's website , the second shortest spacewalk in the history of the space station .

Italian astronaut Luca Parmitano and U.S. astronaut Chris Cassidy were to install backup power equipment to critical station components and prepare cables for a new laboratory module that is due to arrive later this year , NASA said .

Parmitano and Cassidy were able to complete the first task in the spacewalk , Humphries said .

Both astronauts were called back into the station after they and mission control personnel noticed what appeared to be water pooling inside Parmitano 's space suit , Humphries said .

Parmitano `` reported water free-floating behind his head inside his helmet , '' NASA 's website said .

Cassidy told mission control that Parmitano said the water did n't taste like normal drinking water , Humphries said .

This water was `` not an immediate health hazard '' for the astronaut , the website said .

Parmitano did not report any problems breathing , Humphries said .

`` It was an orderly situation in which the crew members and the team on the ground reacted per their standard procedures , and determined that they needed to end to protect the safety of the astronauts that were out on the EVA , '' Humphries said . EVA stands for extravehicular activity .

The spacewalk , which began shortly before 8 a.m. ET , has yet to be rescheduled . NASA said that another attempt would not be made Tuesday .

Mission managers will determine when to reschedule the other tasks that the astronauts would have completed on this spacewalk .

An evaluation of what happened is under way , Humphries said .

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Astronaut reports water free-floating inside his helmet

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Spacewalk ends after one hour and 32 minutes

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This water was `` not an immediate health hazard '' for the astronaut , NASA says